Firmware Update Method for Smart Charging Device

1. A firmware update method for a smart charging device, comprising: (A) updating, by a master computer, a latest firmware to a first board; (B) setting, by the first board, a plurality of work flags to a second board, a third board, a fourth board and a plurality of numbered extension boards; (C) querying, by the first board, a firmware version of the second board and presetting the work flag of the firmware version of the second board as false, and when the firmware version of the second board is older, setting, by the first board, the work flag of the firmware version of the second board as true and updating the firmware version of the second board, and then setting the work flag of the firmware version of the second board as false, and querying again, by the first board, whether the work flag of the firmware version of the second board is set as true, and when the firmware version of the second board is the same as the firmware version of the first board, setting the work flag of the firmware version of the second board as false; (D) according to the procedures of step (C), updating firmware of the third and fourth boards and the plurality of numbered extension boards, so as to completely update the firmware of each of the second board, the third board, the fourth board and the plurality of numbered extension boards.

2. The firmware update method according to claim 1 , wherein input/output interfaces of the first board comprise an I 2 C0 master interface and an I 2 C1 master interface.

3. The firmware update method according to claim 1 , wherein input/output interfaces of each of the second, third and fourth boards and the plurality of numbered extension boards comprise an I 2 C0 slave interface and an I 2 C1 master interface.

4. The firmware update method according to claim 1 , wherein the first board transmits a board number assign instruction to the corresponding board connected to an I 2 C1 master interface thereof, to informs the corresponding board to be the second board.

5. The firmware update method according to claim 1 , wherein the first board transmits a board number assign instruction to the corresponding board connected to an I 2 C0 master interface thereof, to inform the corresponding board to be the third board.

6. The firmware update method according to claim 1 , wherein the third board transmits a board number assign instruction to the corresponding board connected to an I 2 C1 master interface thereof, to inform the corresponding board to be the fourth board.

7. The firmware update method according to claim 1 , wherein the smart charging device is a charging cabinet or a charging car.

8. The firmware update method according to claim 1 , wherein a firmware comprises an outside tool/program accesses firmware inside variable/area (OAI) region, a firmware update information storage region, a public key storage region, and a digital signature storage region.

9. The firmware update method according to claim 8 , wherein the firmware update information storage region is divided into two regions comprising a first region configured to store an operation firmware, and a second region configured to store an update firmware.

10. The firmware update method according to claim 8 , wherein a tool software is used to read the outside tool/program accesses firmware inside variable/area (OAI) region, and import and write firmware update information into the firmware update information storage region, and the firmware update information comprises a CRC32 value and a time serial number, and the firmware is determined as a new version or an old version according to the time serial number.